A Primary Injection Kit is a high-performance electrical testing system designed for testing commissioning maintenance and calibration of current transformers CTs circuit breakers busbars protective relays and other high-current electrical equipment It generates a controlled high-current output by injecting current directly into the primary side of the equipment under test enabling accurate verification of electrical protection systems under real operating conditions Widely used in power generation plants substations industrial facilities utility networks renewable energy installations and transmission and distribution systems it helps ensure reliable protection device operation improves system safety reduces equipment failures and minimizes unplanned downtime